Creating a mortgage calculator involves the development of a user-friendly interface using Vue.js for the frontend. This interface includes dynamic components and input fields for essential information such as loan amount, interest rate, and loan term. Vue.js facilitates real-time updates as users input data, enhancing the user experience. On the backend, Node.js is employed to handle API endpoints responsible for receiving user input and performing mortgage calculations. The calculation logic includes utilizing the mortgage formula to estimate monthly payments, considering factors like principal, interest, and optional details such as property tax and insurance. Robust error handling ensures the application manages edge cases effectively and provides informative messages to users. Optionally, the calculator may integrate with external APIs to fetch real-time interest rates for more accurate calculations. Deployment involves hosting the application on a server, making it accessible to users. Additional features like generating amortization schedules, graphical representations, and the ability to save or share calculations may be included for a more comprehensive user experience. Security measures and thorough testing are essential considerations throughout the development process, particularly when handling sensitive financial information.